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Growth and reproductive responses of Laminaria longicruris (Laminariales, Phaeophyta) to nutrient enrichment

Journal Hydrobiologia
Publisher Springer Netherlands
ISSN 0018-8158 (Print) 1573-5117 (Online)
Issue Volume 204-205, Number 1 / September, 1990
Category Physiology
DOI 10.1007/BF00040278
Pages 505-511
Subject Collection Biomedical and Life Sciences
SpringerLink Date Tuesday, December 21, 2004


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Physiology

Growth and reproductive responses of Laminaria longicruris (Laminariales, Phaeophyta) to nutrient enrichment

C. Yarish1, C. A. Penniman2 and B. Egan1

(1) Department of Ecology and Evolutionary Biology, University of Connecticut, 06903 Stamford, CT, USA
(2) Jackson Estuarine Laboratory, University of New Hampshire, 03924 Durham, NH, USA
Abstract A series of comparative culture experiments were conducted in order to determine responses of Laminaria longicruris male and female gametophytes and juvenile sporophytes to several temperatures (5, 10, 15, 20 °C), light levels (10, 35, 75 µmol m–2 s–1) and media nitrogen concentrations (0, 20, 100 µM ammonium-nitrogen). Responses were measured as numbers of male and female gametophytes producing gametangia and number of sporophytes produced following fertilization. Both male and female gametogenesis was reduced at 5 and 20 °C versus 10 and 15 °C. At 20 °C gametogenesis inhibition was greater with higher levels of ammonium-nitrogen concentration (100 µM). Sporophyte production was more sensitive to light, temperature and nitrogen concentration than gametogenesis. Production of sporophytes was inhibited completely at 20 °C. At lower temperatures, increasingly higher nutrient concentrations produced greater inhibition of production of sporophytes.

Key words growth – kelp –  Laminaria – nutrient enrichment – reproduction

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